The 10 deadliest epidemics throughout history
It is believed that HIV originated in the Democratic Republic of the Congo around 1920 when the disease was spread from chimpanzees to humans.
The first cases of AIDs were reported in 1981, and since then, HIV has resulted in an estimated 65 million infections and 25 million deaths.
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Cholera is a bacterial infection and is mainly contracted through food and water.
The largest cholera outbreak originated in India and spread beyond its borders, killing about 23 000 people in Britain alone.
The Asian Flu Pandemic was an outbreak of avian influenza that started in China and spread worldwide.
The estimated death rate was one to two million people.
Typhus fever is spread by lice. The war brought on poor sanitation that probably led to a higher density of lice and made the transmission more prevalent.
Typhus fever caused three million deaths in Russia alone.
Cocolitzli refers to a collection of pests. Symptoms were much like Ebola but included a dark tongue, jaundice, and neck nodules.
Cocolotzli caused millions of deaths in the territory of New Spain, which is present-day Mexico.
This pandemic affected the Eastern Roman Empire, specifically Constantinople and port cities along the Mediterranean sea. Necrosis of the limbs was one of the terrifying symptoms.
An estimated 25 million people died. The plague returned in waves but was not as severe as this one.
Also known as the plague of Galen, this plague was possibly caused by smallpox or measles.
Almost 2 000 deaths per day were recorded in Rome. The total death toll was about 5 million.
This bubonic plague pandemic started in the Yunnan province in China. Over the next 20 years, rats carried the infectious fleas responsible for the disease to Hong Kong and port cities around the world.
It caused almost 10 million deaths.
The Great Plague started in China and spread all along trade routes to Constantinople and Europe.
An estimated 60% of the European population was wiped out.
The Great Flu claimed between 20 million and 40 million lives. This disease killed more people than WW1.
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Transmissible diseases existed during humankind’s hunter-gatherer days, but the shift to agrarian life 10,000 years ago created communities that made epidemics more possible.
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The earliest recorded pandemic happened during the Peloponnesian War. It passed through Libya, Ethiopia, and Egypt, and it reached Athens as the Spartans laid siege. Two-thirds of the population died.
The disease, suspected to have been typhoid fever, weakened the Athenians significantly and played a big role in their defeat by the Spartans.
It may have been an early appearance of smallpox that began with the Huns.
The Huns then infected the Germans, who passed it to the Romans and then returning troops spread it throughout the Roman empire. This plague continued until about 180 A.D., claiming Emperor Marcus Aurelius as one of its victims.
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An epidemic is a broad term used to describe any problem that is actively spreading and has grown out of control.
The pandemic rel...
Epidemiology is the branch of medicine that handles the following:
Two measurable factors mostly define the level of disease occurrence:
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